Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 1 | // Copyright (C) 2010 David Sugar, Tycho Softworks. |
| 2 | // |
| 3 | // This file is part of GNU uCommon C++. |
| 4 | // |
| 5 | // GNU uCommon C++ is free software: you can redistribute it and/or modify |
| 6 | // it under the terms of the GNU Lesser General Public License as published |
| 7 | // by the Free Software Foundation, either version 3 of the License, or |
| 8 | // (at your option) any later version. |
| 9 | // |
| 10 | // GNU uCommon C++ is distributed in the hope that it will be useful, |
| 11 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | // GNU Lesser General Public License for more details. |
| 14 | // |
| 15 | // You should have received a copy of the GNU Lesser General Public License |
| 16 | // along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | #include "local.h" |
| 19 | |
| 20 | // for older/broken versions of gnutls_hmac_init headers |
| 21 | |
| 22 | class multicode |
| 23 | { |
| 24 | public: |
| 25 | int code; |
| 26 | |
| 27 | inline operator HMAC_ID() |
| 28 | {return (HMAC_ID)code;} |
| 29 | |
| 30 | inline operator MD_ID() |
| 31 | {return (MD_ID)code;} |
| 32 | }; |
| 33 | |
| 34 | void HMAC::release(void) |
| 35 | { |
| 36 | if(context) { |
| 37 | gnutls_hmac_deinit((HMAC_CTX)context, buffer); |
| 38 | context = NULL; |
| 39 | } |
| 40 | |
| 41 | bufsize = 0; |
| 42 | textbuf[0] = 0; |
| 43 | hmacid = 0; |
| 44 | } |
| 45 | |
| 46 | int context::map_hmac(const char *type) |
| 47 | { |
| 48 | if(eq_case(type, "sha") || eq_case(type, "sha1")) |
| 49 | return GNUTLS_MAC_SHA1; |
| 50 | else if(eq_case(type, "sha256")) |
| 51 | return GNUTLS_MAC_SHA256; |
| 52 | else if(eq_case(type, "sha224")) |
| 53 | return GNUTLS_MAC_SHA224; |
| 54 | else if(eq_case(type, "sha384")) |
| 55 | return GNUTLS_MAC_SHA384; |
| 56 | else if(eq_case(type, "sha512")) |
| 57 | return GNUTLS_MAC_SHA512; |
| 58 | else if(eq_case(type, "md5")) |
| 59 | return GNUTLS_MAC_MD5; |
| 60 | else if(eq_case(type, "md2")) |
| 61 | return GNUTLS_MAC_MD2; |
| 62 | else if(eq_case(type, "rmd160")) |
| 63 | return GNUTLS_MAC_RMD160; |
| 64 | else |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | void HMAC::set(const char *digest, const char *key, size_t len) |
| 69 | { |
| 70 | secure::init(); |
| 71 | |
| 72 | release(); |
| 73 | |
| 74 | if(!len) |
| 75 | len = strlen(key); |
| 76 | |
| 77 | if(!len) |
| 78 | return; |
| 79 | |
| 80 | hmacid = context::map_hmac(digest); |
| 81 | |
| 82 | multicode id; |
| 83 | id.code = hmacid; |
| 84 | |
| 85 | if(hmacid) |
| 86 | gnutls_hmac_init((HMAC_CTX *)&context, id, key, len); |
| 87 | } |
| 88 | |
| 89 | bool HMAC::has(const char *type) |
| 90 | { |
| 91 | HMAC_ID id = (HMAC_ID)context::map_hmac(type); |
| 92 | |
| 93 | if(!id || (gnutls_hmac_get_len(id) < 1)) |
| 94 | return false; |
| 95 | |
| 96 | return true; |
| 97 | } |
| 98 | |
| 99 | bool HMAC::put(const void *address, size_t size) |
| 100 | { |
| 101 | if(!context || hmacid == 0) |
| 102 | return false; |
| 103 | |
| 104 | gnutls_hmac((HMAC_CTX)context, address, size); |
| 105 | return true; |
| 106 | } |
| 107 | |
| 108 | const unsigned char *HMAC::get(void) |
| 109 | { |
| 110 | unsigned count = 0; |
| 111 | unsigned size = 0; |
| 112 | |
| 113 | if(bufsize) |
| 114 | return buffer; |
| 115 | |
| 116 | if(!context || hmacid == 0) |
| 117 | return NULL; |
| 118 | |
| 119 | size = gnutls_hmac_get_len((HMAC_ID)hmacid); |
| 120 | release(); |
| 121 | |
| 122 | bufsize = size; |
| 123 | |
| 124 | while(count < bufsize) { |
| 125 | snprintf(textbuf + (count * 2), 3, "%2.2x", |
| 126 | buffer[count]); |
| 127 | ++count; |
| 128 | } |
| 129 | return buffer; |
| 130 | } |